From 0cd990c3c18bb17f4f89f7a64938fcc717bfd2d2 Mon Sep 17 00:00:00 2001
From: 9names <60134748+9names@users.noreply.github.com>
Date: Mon, 3 Oct 2022 11:46:12 +1100
Subject: [PATCH] Comment and pass-through HAL features in BSPs

---
 boards/adafruit-feather-rp2040/Cargo.toml    | 20 ++++++++++++
 boards/adafruit-itsy-bitsy-rp2040/Cargo.toml | 20 ++++++++++++
 boards/adafruit-kb2040/Cargo.toml            | 32 ++++++++++++++++----
 boards/adafruit-macropad/Cargo.toml          | 19 ++++++++++++
 boards/adafruit-qt-py-rp2040/Cargo.toml      | 20 ++++++++++++
 boards/adafruit-trinkey-qt2040/Cargo.toml    | 20 ++++++++++++
 boards/arduino_nano_connect/Cargo.toml       | 20 ++++++++++++
 boards/pimoroni-badger2040/Cargo.toml        | 20 ++++++++++++
 boards/pimoroni-pico-explorer/Cargo.toml     | 20 ++++++++++++
 boards/pimoroni-pico-lipo-16mb/Cargo.toml    | 20 ++++++++++++
 boards/pimoroni-plasma-2040/Cargo.toml       | 20 ++++++++++++
 boards/pimoroni-servo2040/Cargo.toml         | 20 ++++++++++++
 boards/pimoroni-tiny2040/Cargo.toml          | 20 ++++++++++++
 boards/rp-pico/Cargo.toml                    | 19 ++++++++++++
 boards/seeeduino-xiao-rp2040/Cargo.toml      | 20 ++++++++++++
 boards/solderparty-rp2040-stamp/Cargo.toml   | 32 ++++++++++++++++----
 boards/sparkfun-pro-micro-rp2040/Cargo.toml  | 20 ++++++++++++
 boards/sparkfun-thing-plus-rp2040/Cargo.toml | 20 ++++++++++++
 boards/vcc-gnd-yd-rp2040/Cargo.toml          | 20 ++++++++++++
 19 files changed, 390 insertions(+), 12 deletions(-)

diff --git a/boards/adafruit-feather-rp2040/Cargo.toml b/boards/adafruit-feather-rp2040/Cargo.toml
index a78347b..cb6ba29 100644
--- a/boards/adafruit-feather-rp2040/Cargo.toml
+++ b/boards/adafruit-feather-rp2040/Cargo.toml
@@ -25,7 +25,27 @@ smart-leds = "0.3.0"
 ws2812-pio = "0.4.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it doesn't hurt to enable it
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/adafruit-itsy-bitsy-rp2040/Cargo.toml b/boards/adafruit-itsy-bitsy-rp2040/Cargo.toml
index f4e3044..ea5ec90 100644
--- a/boards/adafruit-itsy-bitsy-rp2040/Cargo.toml
+++ b/boards/adafruit-itsy-bitsy-rp2040/Cargo.toml
@@ -25,7 +25,27 @@ ws2812-pio = "0.4.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it doesn't hurt to enable it
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/adafruit-kb2040/Cargo.toml b/boards/adafruit-kb2040/Cargo.toml
index 2922fba..5f5746d 100644
--- a/boards/adafruit-kb2040/Cargo.toml
+++ b/boards/adafruit-kb2040/Cargo.toml
@@ -17,12 +17,6 @@ cortex-m-rt = { version = "0.7.0", optional = true }
 embedded-hal = { version = "0.2.4", features = ["unproven"] }
 rp2040-boot2 = { version = "0.2.0", optional = true }
 
-[features]
-default = ["boot2", "rt", "critical-section-impl"]
-critical-section-impl = ["rp2040-hal/critical-section-impl"]
-boot2 = ["rp2040-boot2"]
-rt = ["cortex-m-rt","rp2040-hal/rt"]
-
 [dev-dependencies]
 panic-halt = "0.2.0"
 rp2040-boot2 = "0.2"
@@ -30,3 +24,29 @@ smart-leds = "0.3.0"
 fugit = "0.3.5"
 nb = "1.0.0"
 ws2812-pio = "0.4.0"
+
+[features]
+# This is the set of features we enable by default
+default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
+critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
+boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
+rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it doesn't hurt to enable it
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/adafruit-macropad/Cargo.toml b/boards/adafruit-macropad/Cargo.toml
index 7ef090f..edce123 100644
--- a/boards/adafruit-macropad/Cargo.toml
+++ b/boards/adafruit-macropad/Cargo.toml
@@ -21,8 +21,27 @@ panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
 
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it doesn't hurt to enable it
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/adafruit-qt-py-rp2040/Cargo.toml b/boards/adafruit-qt-py-rp2040/Cargo.toml
index 988332e..ba93d97 100644
--- a/boards/adafruit-qt-py-rp2040/Cargo.toml
+++ b/boards/adafruit-qt-py-rp2040/Cargo.toml
@@ -25,7 +25,27 @@ ws2812-pio = "0.4.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/adafruit-trinkey-qt2040/Cargo.toml b/boards/adafruit-trinkey-qt2040/Cargo.toml
index 87b5175..02fe8a3 100644
--- a/boards/adafruit-trinkey-qt2040/Cargo.toml
+++ b/boards/adafruit-trinkey-qt2040/Cargo.toml
@@ -24,7 +24,27 @@ ws2812-pio = "0.4.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/arduino_nano_connect/Cargo.toml b/boards/arduino_nano_connect/Cargo.toml
index d45152d..b55e375 100644
--- a/boards/arduino_nano_connect/Cargo.toml
+++ b/boards/arduino_nano_connect/Cargo.toml
@@ -24,7 +24,27 @@ nb = "1.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-badger2040/Cargo.toml b/boards/pimoroni-badger2040/Cargo.toml
index 83fce85..11c4bbe 100644
--- a/boards/pimoroni-badger2040/Cargo.toml
+++ b/boards/pimoroni-badger2040/Cargo.toml
@@ -23,7 +23,27 @@ panic-halt= "0.2.0"
 nb = "1.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-pico-explorer/Cargo.toml b/boards/pimoroni-pico-explorer/Cargo.toml
index 61e6a4d..9f9b2d7 100644
--- a/boards/pimoroni-pico-explorer/Cargo.toml
+++ b/boards/pimoroni-pico-explorer/Cargo.toml
@@ -28,7 +28,27 @@ arrayvec = { version="0.7.1", default-features=false }
 nb = "1.0.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-pico-lipo-16mb/Cargo.toml b/boards/pimoroni-pico-lipo-16mb/Cargo.toml
index 9c925e9..1aee502 100644
--- a/boards/pimoroni-pico-lipo-16mb/Cargo.toml
+++ b/boards/pimoroni-pico-lipo-16mb/Cargo.toml
@@ -22,7 +22,27 @@ embedded-hal ="0.2.5"
 nb = "1.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-plasma-2040/Cargo.toml b/boards/pimoroni-plasma-2040/Cargo.toml
index c1764f5..c623491 100644
--- a/boards/pimoroni-plasma-2040/Cargo.toml
+++ b/boards/pimoroni-plasma-2040/Cargo.toml
@@ -28,7 +28,27 @@ defmt = "0.3.0"
 defmt-rtt = "0.3.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-servo2040/Cargo.toml b/boards/pimoroni-servo2040/Cargo.toml
index 3373130..6d5becc 100644
--- a/boards/pimoroni-servo2040/Cargo.toml
+++ b/boards/pimoroni-servo2040/Cargo.toml
@@ -28,7 +28,27 @@ smart-leds = "0.3.0"
 ws2812-pio = "0.4.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/pimoroni-tiny2040/Cargo.toml b/boards/pimoroni-tiny2040/Cargo.toml
index c82d8d1..15ae61d 100644
--- a/boards/pimoroni-tiny2040/Cargo.toml
+++ b/boards/pimoroni-tiny2040/Cargo.toml
@@ -26,7 +26,27 @@ defmt = "0.3.0"
 defmt-rtt = "0.3.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/rp-pico/Cargo.toml b/boards/rp-pico/Cargo.toml
index 674febe..63f512d 100644
--- a/boards/rp-pico/Cargo.toml
+++ b/boards/rp-pico/Cargo.toml
@@ -43,8 +43,27 @@ defmt = "0.3.0"
 defmt-rtt = "0.3.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
 rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/seeeduino-xiao-rp2040/Cargo.toml b/boards/seeeduino-xiao-rp2040/Cargo.toml
index e0fb62d..ea84429 100644
--- a/boards/seeeduino-xiao-rp2040/Cargo.toml
+++ b/boards/seeeduino-xiao-rp2040/Cargo.toml
@@ -23,7 +23,27 @@ embedded-hal ="0.2.5"
 nb = "1.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/solderparty-rp2040-stamp/Cargo.toml b/boards/solderparty-rp2040-stamp/Cargo.toml
index aaff12e..975171f 100644
--- a/boards/solderparty-rp2040-stamp/Cargo.toml
+++ b/boards/solderparty-rp2040-stamp/Cargo.toml
@@ -16,12 +16,6 @@ rp2040-boot2 = { version = "0.2.0", optional = true }
 rp2040-hal = { path = "../../rp2040-hal", version = "0.6.0" }
 cortex-m-rt = { version = "0.7", optional = true }
 
-[features]
-default = ["boot2", "rt", "critical-section-impl"]
-critical-section-impl = ["rp2040-hal/critical-section-impl"]
-boot2 = ["rp2040-boot2"]
-rt = ["cortex-m-rt","rp2040-hal/rt"]
-
 [dev-dependencies]
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
@@ -30,3 +24,29 @@ smart-leds = "0.3.0"
 pio = "0.2.0"
 ws2812-pio = "0.4.0"
 fugit = "0.3.5"
+
+[features]
+# This is the set of features we enable by default
+default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
+critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
+boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
+rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/sparkfun-pro-micro-rp2040/Cargo.toml b/boards/sparkfun-pro-micro-rp2040/Cargo.toml
index d4e646f..44afcdb 100644
--- a/boards/sparkfun-pro-micro-rp2040/Cargo.toml
+++ b/boards/sparkfun-pro-micro-rp2040/Cargo.toml
@@ -26,7 +26,27 @@ ws2812-pio = "0.4.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/sparkfun-thing-plus-rp2040/Cargo.toml b/boards/sparkfun-thing-plus-rp2040/Cargo.toml
index a63ed18..4a7f7b9 100644
--- a/boards/sparkfun-thing-plus-rp2040/Cargo.toml
+++ b/boards/sparkfun-thing-plus-rp2040/Cargo.toml
@@ -26,7 +26,27 @@ ws2812-pio = "0.4.0"
 fugit = "0.3.5"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]
diff --git a/boards/vcc-gnd-yd-rp2040/Cargo.toml b/boards/vcc-gnd-yd-rp2040/Cargo.toml
index 0f274ec..795b3e9 100644
--- a/boards/vcc-gnd-yd-rp2040/Cargo.toml
+++ b/boards/vcc-gnd-yd-rp2040/Cargo.toml
@@ -28,7 +28,27 @@ ws2812-pio = "0.4.0"
 pio = "0.2.0"
 
 [features]
+# This is the set of features we enable by default
 default = ["boot2", "rt", "critical-section-impl"]
+
+# critical section that is safe for multicore use
 critical-section-impl = ["rp2040-hal/critical-section-impl"]
+
+# 2nd stage bootloaders for rp2040
 boot2 = ["rp2040-boot2"]
+
+# Minimal startup / runtime for Cortex-M microcontrollers
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+
+# This enables a fix for USB errata 5: USB device fails to exit RESET state on busy USB bus.
+# Only required for RP2040 B0 and RP2040 B1, but it also works for RP2040 B2 and above
+rp2040-e5 = ["rp2040-hal/rp2040-e5"]
+
+# Memoize(cache) ROM function pointers on first use to improve performance
+rom-func-cache = ["rp2040-hal/rom-func-cache"]
+
+# Disable automatic mapping of language features (like floating point math) to ROM functions
+disable-intrinsics = ["rp2040-hal/disable-intrinsics"]
+
+# This enables ROM functions for f64 math that were not present in the earliest RP2040s
+rom-v2-intrinsics = ["rp2040-hal/rom-v2-intrinsics"]